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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Jun-19-2017, 03:48:26 AM   #1
TheDoogan
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Default Leaky Rear Diff - $1,100 sound fair?

Hey guys, one more question tonight:

My car was not driven very much before I bought it, for a few years. Either do to that (or because I've been rough on the rear diff as I learn the car), it began leaking at "the rear pinion seal" shortly after I got it. I now have about 11 different quarter sized drip spots on my garage floor.

After 6,000 miles, the guys at my shop said the rear diff was a little low, and that they'd recommend having them remove the rear diff and have a partner of theirs rebuild it.

They said this would cost about $900 if it was just the 'main seal', up to $1,300 if more than that needed to be rebuilt.

I ask because they've made a few mistakes lately: does this make sense to you guys? Does it sound like a fair price? I have zero problem paying it, I just don't want these guys to fudge up my car.

Is this a job any of you guys would try on your own?

Thanks all.
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Old Mon, Jun-19-2017, 03:51:52 AM   #2
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Way too much.

I had 4:10 installed and set up with new seals and shims for $400. I supplied R&P, seals and bearings.


There's nothing special about these diffs.
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Old Mon, Jun-19-2017, 04:39:09 AM   #3
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Seems pricey. Call another shop and compare prices. Also look at reviews regarding customer service.
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Old Mon, Jun-19-2017, 04:39:11 AM   #4
RedM3/4
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Default Re: Leaky Rear Diff - $1,100 sound fair?

search pinion seal replacement here. I'm pretty sure that's where nearly all leaks are, and the diff isn't normally removed. I think you ought to shop for a new shop.

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Old Mon, Jun-19-2017, 05:04:37 AM   #5
TboneM3
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Also, weeping out where the halfshafts bolt up is normal - maybe the mechanics are exaggerating?
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Old Mon, Jun-19-2017, 09:38:19 PM   #6
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Quote:
Originally Posted by TheDoogan View Post
Hey guys, one more question tonight:

My car was not driven very much before I bought it, for a few years. Either do to that (or because I've been rough on the rear diff as I learn the car), it began leaking at "the rear pinion seal" shortly after I got it. I now have about 11 different quarter sized drip spots on my garage floor.

After 6,000 miles, the guys at my shop said the rear diff was a little low, and that they'd recommend having them remove the rear diff and have a partner of theirs rebuild it.

They said this would cost about $900 if it was just the 'main seal', up to $1,300 if more than that needed to be rebuilt.

I ask because they've made a few mistakes lately: does this make sense to you guys? Does it sound like a fair price? I have zero problem paying it, I just don't want these guys to fudge up my car.

Is this a job any of you guys would try on your own?

Thanks all.
Two jobs that aren't diy if it's the diff seal/plate and oil pan gasket.

I paid like 600 for the diff seal to be replaced and while your down there you need to make sure you check the bushings and replace if necessary. No need to rebuild/replace the diff in most cases.
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Old Mon, Jun-19-2017, 10:03:43 PM   #7
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Bro you can find a low mileage ENTIRE diff for 500/600 on the forums here or other, or eBay.
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Old Mon, Jun-19-2017, 11:32:13 PM   #8
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Quote:
Originally Posted by TboneM3 View Post
Also, weeping out where the halfshafts bolt up is normal - maybe the mechanics are exaggerating?
No, the diff should not weep. My input weeped and I replaced all the seals. The side shafts never leaked oil. There is an o ring between the diff body and the flanges, there rod a rotating seal between the shaft and flange. There is even a special seal that goes on 2 of the 8 flange bolts because they connect with oil inside. No leakage

Last edited by schoonerm3; Tue, Jun-20-2017 at 06:05:07 AM.
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Old Mon, Jun-19-2017, 11:40:31 PM   #9
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Default Re: Leaky Rear Diff - $1,100 sound fair?

Mine weeped. I just lived with it but it didn't leave spots on driveway.


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Old Mon, Jun-19-2017, 11:57:44 PM   #10
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Default Re: Leaky Rear Diff - $1,100 sound fair?

getting my pinion seal and half shaft seals done for ~500 tomorrow. I bought my low mileage m3 with the pinion seal slightly leaking, now it's hemoraging.
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Discussing Leaky Rear Diff - $1,100 sound fair? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)